Slow-Cooker Creamy Fajita Steak, Potato & Queso Blanco Casserole

This slow-cooker casserole brings together all the flavors of fajitas—tender steak, sweet bell peppers, and warm spices—with the comfort of golden potatoes and a creamy queso blanket. Just layer the ingredients in the Crockpot, walk away, and come back to a bubbling, cheesy dinner that feeds a crowd.

The Pepper Jack on top melts into a golden crust, while the queso keeps everything luscious. Serve it with avocado, sour cream, and lime for a Tex-Mex feast that feels like a celebration.

Fajita night gets a slow-cooker makeover with this hearty casserole. Thinly sliced sirloin steak, halved baby gold potatoes, and tri-color bell peppers simmer low and slow in white queso blanco until everything is fork-tender.

A final shower of shredded Pepper Jack cheese melts into a creamy, slightly spicy topping. This dish is the ultimate dump-and-go dinner: minimal prep, maximum flavor. It's perfect for busy weeknights or casual gatherings, and the leftovers are just as delicious.

Ingredients

Why this recipe works

Cooking the steak and potatoes together in the slow cooker allows the flavors to meld and the meat to become exceptionally tender. The low heat breaks down the connective tissue in the sirloin, resulting in melt-in-your-mouth strips.

Meanwhile, the potatoes absorb the seasoned queso and juices, becoming creamy and savory. This method requires almost no effort, yet produces a deeply satisfying, homey meal.

The combination of white queso blanco and Pepper Jack creates a rich, double-cheese sauce that coats every ingredient. The queso keeps the dish moist and adds a tangy creaminess, while the Pepper Jack brings a gentle heat and a golden finish. Layering the ingredients rather than stirring ensures even cooking and a beautiful presentation when you lift the lid.

Notes and substitutions

For the best texture, choose a sirloin steak that is at least 1 inch thick and slice it against the grain into thin strips. Baby gold potatoes are ideal because they hold their shape and become buttery. If you can't find baby golds, use red potatoes or Yukon Golds cut into 1-inch chunks. The fajita seasoning adds a smoky, spiced flavor; adjust the amount to your heat preference.

White queso blanco is available in jars or as a block that you can melt. If using a block, cut it into small chunks and let it melt during cooking. You can also make a quick queso by melting white American cheese with a splash of milk.

The slow cooker does the work, but make sure the queso is pourable before adding it. Avoid opening the lid during cooking to maintain a consistent temperature.

• sirloin steak: flank steak or skirt steak, sliced thinly against the grain
• baby gold potatoes: red potatoes or Yukon Gold potatoes, cut into 1-inch chunks
• white queso blanco: a homemade queso made with white American cheese and milk, or a store-bought white queso dip
• Pepper Jack cheese: Monterey Jack with a pinch of cayenne or sliced jalapeños

Equipment

• 6-quart slow cooker
• Cutting board
• Chef's knife
• Measuring cups and spoons
• Mixing spoon
• Oven mitts